Screen



E. DEISTER May 26, 1931.

SCREEN Filed Nov. 19, 1926 QM mm INVENTOR. QA half Dada Zcr A TTORNEY.

Patented May 26, 19 31 UNITED STATES EMIL DEISTER, F FORT WAYNE, INDIANA SCREEN Application filed November 19; 19a -seiiai in. 149,324.

The invention relates to screens for the grading and cleaning of various materials such as gravel, sand, etc., wherein a cantilever is vibrated by a mechanism mounted thereon and is connected to a screening medium that is mounted on a frame resiliently connected to the cantilever and to a support. I have found that'the main resilient connection of the cantilever to the frame sags somewhat due to the weight of the cantilever, thereby reducing its efiiciency somewhat and also that the support tends to vibrate excessively under the influence of the vibrating frame.

The object of my present invention is to provide a simple screen, portable or stationary, in which the foregoing objections are overcome. r

Another object is to provide a screen with a detachable auxiliary screening member, into which will fall the materials that do not pass through the main screening medium.

An embodiment of the invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevational view of a screen embodying the invention; Fig. 2 a front elevational view of the screen; Fig. 3 a central longitudinal cross-sectional view of the screen; Fig. 4 a plan view of the detachable screening member and Fig. 5 a rear view of the cantilever and main support or a-Xle illustrating the yoke member that ties the isjupport to one of the resilient frame memers.

In the illustrative embodiment of the invention 1 is the main frame consisting of two side members 2 and 3 and an end member 4:. A main resilient bar 5 is secured at its opposite ends to the side members 2 and 3 and it is also secured in its middle portion by the bolt 6 to the approximate middle portion of a resilient cantilever 7 A second resilient bar 8 having greater resilience than the bar 5 is also secured to the side members 2 and 3 and to the cantilever 7 A bar 9 is bolted to the forward end of the cantilever and is se-, cured by the bolt 10 to the screening medium 11 that is suitably supported in tension on the main frame. 7

An electric motor 12 is mounted on the cantilever adjacent to the rear end thereof and one or more unbalanced pulleys 1-3 are mounted on the shaft of the motor by which to vibrate the cantilever.

- An angle bar let is secured to the rear side of the end member-eof the main frame. A bolt 15 is extended through one web of this bar 14 and it isalso loosely extended through the cantilever 7. A coiled spring 16 encir? cles the bolt and is held in contact with the cantilever a washer 17 and nuts 18 on the bolt. This spring,when the proper ten sion is placed upon it by adjusting the nuts 18, removes the strain on the main resilient cross bar 5 occasioned by the weight of the cantilever and the motor, without interfering with the proper vibration of the forward end of the cantilever. All sagging of this bar 5 is avoided by the bolt 15 and the spring.

Two plates 19 are secured to the side memhers 2 and 3 of the main frame and depend therefrom. Their lower ends aresuitably secured to resilient members, such as leaf springs 20 that arevmounted on a support 21,

which support, in the present embodiment of the invention, is an axle having the wheels 22thereon.' V To avoid excessive vibration of this sup port 21, I secure a yoke 23 .to the middle portion of the support by a clevis 24 and secure the free ends of the yoke to the low er side of the main resilient bar 5. at itsmiddle portion, which portion is relatively quiet when the device is in operation.

A foot 25 isadjust-ably secured to the side members 2 and 3 by which the inclination-of the main frame is regulated, the foot resting on the ground or ,otherfixed support.

Two brackets 26 are secured at one end to the forward ends ofthe side members 2 and 3 respectively, the free arm of each bracket extending upwardly and forwardly. An open top and bottom box '27 having a screen; ing medium 28 in its bottom has an inclined cleat 29 on the outerside of each end wall These cleats are adaptiedto engage the free arms of the brackets 26 and support the box, the upward inclination of the arms and cleats tending to prevent unauthorized disengage ment'of the box fromthe brackets.

This screening box catches the waste or and to the resilient bar to avoid excessive vioversize materials descending from the lower bration of the support. end of the screening medium so that they will In witness whereof I hereunto sign my not mingle with the material that has passed name this 16th day of November, 1926. through the screening medium or that which EMIL DEISTER. is being deposited on that medium.

The device is well adapted for screening molding sand in foundries. Cores, nails and other matter found in used sand are readily m removed by the medium and caught in the box 27 and any sand deposited in the box by the workman While he is depositing the sand on the screening medium, falls through the screened bottom of the box as the box vibrates under the influence of the vibrating frame 1.

hat I claim is 1. The combination of a support, a marginal frame mounted on the support, a screen- 20 ing medium mounted in tension on the frame,

av lever resiliently supported beneath the medium and connected at one end to the medium, a vibrating mechanism mounted on the opposite end of the lever to positively vibrate the 25 lever, a resilient transverse member secured at its opposite ends to the opposite sides of the frame and means intermediate the ends of the lever rigidly securing the lever to the central portion of the resilient transverse mem- 30 i361.

2. The combination'ofa support, a marginal frame mounted on the support, a screening medium supported in tension in the frame, a lever resiliently supported beneath the medium extending longitudinally there- 7 with and connected at one end to substantially the middle portion of the medium, a 'ibrating mechanism mounted on the opposite end of the lever to positively vibrate the lever, a resilient bar extending across the frame and beneath the medium and rigidly connected at its central point to the lever intermediate the ends of the lever and a second resilient bar extending across and beneath the frame and secured to the lever between the V first named resilient bar and the end of the lever that is secured to the screening medium, the second bar having greater resilience than the first named bar. 50 3. The combination of a support, a mar- V ginal frame mounted on the support, a screening medium supported in tension on the frame, a lever resiliently supported beneath the frame and the medium and cxtending longitudinally therewith, and connected at one end to the screening medium, mechanism mounted on the opposite end of the lever to cause the other end of the level to positively vibrate, a resilient bar secured at its opposite ends to the opposite sides of the frame, a bolt extending through the central portion of the bar and through the lever be-- tween the opposite ends of the lever to rigidly secure the lever to the lower side of the bar and a brace member secured to the support if" X 

